package first.niuke.simple;

/**
 * @ClassName NC117
 * @description:
 * @author: 荣燊
 * @create: 2021-06-15 16:39
 **/
public class NC117 {
    // 合并二叉树
    public class TreeNode {
        int val = 0;
        TreeNode left = null;
        TreeNode right = null;
    }

    public TreeNode mergeTrees (TreeNode t1, TreeNode t2) {
        // write code here
        if (t1 == null) {
            return t2;
        }
        if (t2 == null) {
            return t1;
        }
        t1.val += t2.val;
        t1.left = mergeTrees(t1.left, t2.left);
        t1.right = mergeTrees(t1.right, t2.right);
        return t1;
    }
}
